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| 振荡翼型气动及其噪声特性的数值研究 |
| Numerical Simulation on Unsteady Aerodynamic Noise Characteristics of Oscillating Airfoil |
| 投稿时间：2015-02-04 |
| DOI：10.13259/j.cnki.eri.2017.03.008 |
| 中文关键词: 振荡机翼 折合频率 气动噪声 指向性曲线 Lighthill声类比 |
| 英文关键词:oscillating airfoil reduced frequency aerodynamic noise directivity curve Lighthill acoustic analogy |
| 基金项目:上海市科委科研计划资助项目（13DZ2260900） |
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| 中文摘要: |
| 针对低雷诺数下翼型的非定常气动噪声特性，采用计算流体力学（CFD）与Lighthill声类比相结合的方法，分别对俯仰、平振以及俯仰与平振耦合运动的翼型进行了分析，通过自定义程序控制翼型的运动规律，并对其流场及诱导的声场特性进行了数值仿真.结果表明：随着折合频率、振幅的增加，翼型表面升力系数的峰值增大，非定常迟滞效应增强；耦合运动的相位差改变了气动力的响应特性；对于振荡翼型激发的噪声，低频下单极子声源占主要地位；随着声源频率的增大，远场声压指向性逐渐体现出偶极子声源的特性. |
| 英文摘要: |
| The combination of computational fluid dynamics(CFD) and Lighthill acoustic analogy was applied to analyze the unsteady aerodynamic noise characteristics of oscillating airfoil at low Reynolds number.The unsteady performance of the airfoil was studied under the conditions of pitching,flapping and the coupling oscillation,respectively.The airfoil movements were controlled using custom program.The results showed that with the increasing of reduced frequency and amplitude,the peak value of lift coefficient in the airfoil surface increased.So did the unsteady hysteresis effect.The phase differences of coupling oscillation changed the aerodynamic characteristics.For the noise excited from oscillating airfoil,it was predominantly the monopole source.With the rising of the sound source frequency,the far-field sound pressure directivity had a trend towards to dipole source. |
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